Delta2 Chamaeleontis
Location of δ2 Chamaeleontis (circled in red) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 10h 45m 47.00487s[1] |
| Declination | −80° 32′ 24.6785″[1] |
| Apparent magnitude (V) | 4.42[2] |
| Characteristics | |
| Spectral type | B3 V[3] or B2.5 IV[4] |
| U−B color index | −0.728[2] |
| B−V color index | −0.192[2] |
| Astrometry | |
| Radial velocity (Rv) | +22.6[5] km/s |
| Proper motion (μ) | RA: −36.86[1] mas/yr Dec.: +5.90[1] mas/yr |
| Parallax (π) | 9.30±0.13 mas[1] |
| Distance | 351 ± 5 ly (108 ± 2 pc) |
| Absolute magnitude (MV) | −0.71[6] |
| Details | |
| Mass | 5.0±0.1[7] M☉ |
| Radius | 3.9[8] R☉ |
| Luminosity | 503[9] L☉ |
| Temperature | 15,873[9] K |
| Age | 32.6±16.3[7] Myr |
| Other designations | |
| δ2 Cha, CPD−79°556, FK5 411, HIP 52633, HR 4234, SAO 258593[10] | |
| Database references | |
| SIMBAD | data |
Delta2 Chamaeleontis, Latinized from δ2 Chamaeleontis, is a solitary[11] star located in the southern circumpolar constellation of Chamaeleon. It has an apparent visual magnitude of 4.42,[2] which is bright enough for the star to be seen with the naked eye. Based upon an annual parallax shift of 9.30 mas,[1] it is located around 351 light years from the Sun. This star is one of two stars named Delta Chamaeleontis, the other being the fainter Delta1 Chamaeleontis located about 6 arcminutes away.[12] Delta Chamaeleontis forms the southernmost component of the constellation's "dipper" or bowl. Together with Gamma Chamaeleontis, they point to a spot that is within 2° of the south celestial pole.[13]
This is a B-type main sequence star with a stellar classification of B3 V.[3] However, Hiltner et al. (1969) give a classification of B2.5 IV,[4] which would suggest it is a more evolved subgiant star. It is estimated to have five[7] times the mass of the Sun and 3.9[8] times the Sun's radius. With an age of 32.6[7] million years, it is radiating over 500 times the solar luminosity from its outer atmosphere at an effective temperature of 15,873[9] K. There is a 70% likelihood that this star is a member of Gould's Belt.[14]
References
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